Không nghe được VOV giao thông 91MHz

chakuchak nói:

He he không phải tại xe mà là tại cái radio đấy cụ ơi. Con xe Zace của em cũng nhảy 2 bước 1 theo số lẻ nên mấy kênh chẵn là bó tay. Đang định nghiên cứu cái đó thì lấy xe mới nên không quan tâm đến nữa

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snowflower nói:

Em đang nghiên cứu mà chưa ra, híc. Cụ vô tình tìm được thông tin cách khắc phục vụ này thì cụ ới em với nhá

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International conventions

The range of "radio frequencies" is a matter of international convention. The separation of countries into the three formal ITU RF allocation regions is the source of different RF allocation among continents. The definition of the ITU Regions (capital R, for ITU-R Regions) is based largely on longitude. According to ITU Radio Regulations (RR) section 5.1: Member States assign licences to stations and Article 5 of the ITU RR allocates frequencies to services (such as Broadcasting and Mobile). The ITU divides the world into five administrative regions:
A- the Americas,
B- Western Europe,
C- Eastern Europe and Northern Asia,
D-Africa and
E-Asia and Australasia.
The ITU also categorises states into three Radio regulatory Regions:
Region 1: Europe, Middle East, Africa, the former Soviet Union, including Siberia; and Mongolia;
Region 2: North and South America and Pacific (East of the International Date Line);
Region 3: Asia, Australia and the Pacific Rim (West of the International Date Line).

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I have a car stereo purchased from the US and I can’t pick up all radio stations in Europe/UK, what can I do?
If you have purchased a car stereo from the US you will find that it will not pick up many European radio stations. This is due to the fact that US radio frequency steps are different to here in Europe.
You may be able to set the tuner to European stations by following this procedure.
Press and hold down the SRC button to power down the unit completely.
While the unit is off press button 1 & 5 together, while momentarily pressing the SRC button.
If this does not work try the following proceedure;
Press and hold buttons 1 and 5 together, while momentarily pressing the reset button.
If this does not work then the unit is not designed to pick up European frequency steps.

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I live in Hungary and i was the same problem with original FM radio.

I built a device to the antenna input that shift the FM frequency 0,1 MHz.
Now the radio find every channels, the ones with odd number ending freqs, just the even number ending frequency channels will appear at 0,1 MHz lower frequency than before:

The original radio channel frequency in the picture: 94,8 PETOFI, 97,8 RADIR, 100,8 SLAGER, 105,6 MR1, 107,0 KEK DUNA, 107,8 MR1.

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See below. It doesn't say you can actually change the area from US to EU, but worth a try entering to the Service mode and play around to see if you can change it.

Radio Revision TSB:
Radio, Stereo, and Compact Disc: Description and Operation New Generation Radios
Introduction
Starting September 2000, a family of new generation radios will begin to be phased into production.
The exception to this is the E52 which has been available with the MIR (multi-information radio) NG radio since series
launch in mid 2000.

The NG "New Generation" radios will have increased functions: -Radio can be operated without KL R.
-Radios are world frequency. -Car memory programming. -Audio mixing on vehicles equipped with navigation.
The radios external appearance has not changed. NG radios can be identified by their "53" designation.
Overview of the Radios for Each Model


Functional Overview
NG Radios

Radio Operation with KL R off
Operation is possible with the key off on the C53 and CD 53 radios. If the radio is turned on with KL R off, it will operate for 16 minutes until the General Module sends the sleep command. The radio can be turned on and off as many times desired.

Diversity Antenna
Antenna diversity has been adapted to the new generation of radios. When the radio is in operation, the diversity control unit is activated by the "RAD ON" signal.

World Frequency Radio
Radios on vehicles sold in the U.S. are world radios. Specific country settings can be made using the service mode. The settings are stored in an EEPROM.

Car Memory
If programmed, when locking the vehicle using the remote transmitter the: -last station -Volume setting -Last audio mode (Tape, FM, CD etc.) are stored according to the key number used. Unlocking the vehicle with the same transmitter will restore the settings. There is a maximum setting for volume which may be lower than the setting when the radio was last operated.

Clock
Time can also be displayed when KL R is off by pressing the clock button on the Radio/MID.

Back lighting
The LCM/LSZ produces two signals for the control of radio backlighting. -Hardwired KL 58g -Lights on/off over the K/I Bus. The radio contains a photo-cell for adjustment of backlighting to ambient conditions.

Reset and Voltage Monitoring
A radio reset is triggered by under voltage or the internal processor monitor. The reset function restarts the radio, similar to turning it off and back on again. Operating voltage is measured at the KL 30 input. The radio is switched off if the system voltage exceeds 17V to protect the radio, it will switch on when the voltage falls below 16V.

GAL (Speed Dependent Volume)
The speed signal from the IKE/KOMBI is available to the radio over the K/I Bus. GAL is not a feature on vehicles equipped with DSP.

Bus Communication
The radio communicates with other modules via the K bus or I Bus dependent on the model. The information shared over the bus line includes: -IKE/KOMBI - Terminal status (KL 15, KL R) -LCM/LSZ - Lights on -IKE/KOMBI link to TXD - Diagnosis -MID or BMBT - button or rotary knob status. -GM - Key used to lock or unlock vehicle -MFL - audio controls status

NG radios do not use anti-theft codes. Operation of the radio is only possible it connected to a bus line and the detection of at least one other component.
Multi Information Radio (MIR)

The Multi-Information Radio (MIR) is used in the E52 Z8 and is the first 01 the NG series of radios. The MIR contains the radio receiver, display screen, and control panel all in one unit. A cassette player is not included.
The MIR is used to control and display the: -GPS-Navigation System -Audio system including CD Changer -Telephone -Outside temperature

Every time the MIR is switched on it looks to see if a navigation computer is installed and displays the correct menu options. Text and symbols on the display are generated by the navigation computer and transmitted to the MIR via the "Navigation" Bus. If the MIR does not detect that a navigation computer is connected, the MIR itself will generate it's own display signals. The screen display is monochrome only.
The navigation elements of the MIR will be discussed in the MK3 module.

Audio Mixing
Audio mixing allows the vehicle passengers to listen to navigation instructions without muting the radio or CD player.
On-Board Computer Functions
Outside temperature is the only on-board computer display possible for the Z8.


Service Mode for NG Radios
A service mode is available as on previous radios as a diagnosis tool and/or changing radio settings. Entering the service mode varies by the device used to control the radio.


To enter the service mode:

C53KD53 with and without MID: -Turn on the radio, -Within 8 seconds, press and hold the "m" button for 8 seconds. -Scroll through functions using the "+" and "-" keys or the station < > search buttons. -Turn off the radio to end the service mode.

C53 MIR: -Turn on the radio. -Within 8 seconds, press and hold the "SET" button for at least 8 seconds. -Scroll through functions using the station < > search buttons. -Turn off the radio to end the service mode.

BM53 with board monitor: -Turn on the radio. -Press and hold the "RDS" button for at least 8 seconds. -Scroll through the functions using the station < > search buttons -Turn off the radio to end the service mode.

BM53 with Widescreen board monitor: -Turn on the radio. -Within 8 seconds, press the "INFO" button. -From the info screen select RDS -Press and hold the BM control knob for at least 8 seconds. -Scroll through functions using the station < > search buttons. -Turn off the radio to end the service mode

Service Mode Functions
1.Serial Number: Display of the radio serial number.
2.Software version: Display of the radio software version. Displayed as (calender week, year, version)
3.GAL: Speed-sensitive volume control. Can be adjusted from level 1-6 using the 6 pre-set audio buttons. Vehicles equipped with DSP do not use this feature.
4.Field strength and Quality (F/Q): The station currently displayed can be assessed for field strength and quality. An "F" (i.e. F15) number is used to indicate the strength of the signal being received by the radio. This is a good test of the antenna system, station signal, and the radio itself. A "Q" (i.e. Q-00)number is used to determine the quality of the radio station including both the audio and RDS signal if applicable.
5.DSP: This function provides information about whether the vehicle is fitted with DSP. The value is displayed as a one (fitted)or zero (not fitted) and is communicated by the DSP amplifier via the I/K bus.
6.TP Volume: Provides adjustment for traffic report minimum volume. Not used in the US.
7.AF: Alternative Frequency tracking setting. Not used in the US.
8.Area: Used to select the appropriate market setting (USA, Canada, Europe, Japan and Oceania). Adjust using the pre-set buttons.
9.Index: Display of the revision index.

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I just checked on mine and it can be changed.

-Turn the radio ON with ignition off and press the M button for about 10 seconds.
-The hidden menu will appear.
-When you scroll through the menue, (with the -/+ buttons) stop on USA and use the arrows to change regions, stop in EUR, and hit hit the M button.
-The radio will then reset itself. Turn it off and ON again. You will be able to use the frequencies you are looking for.

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I have recently discovered that the HU 613 radio in my 2003 XC70 has some hidden menus that Volvo didn't tell me about and was NOT in my owners manual. It turns out there's equalizer setiings for both the front and rear speakers. It made my stereo sound much, much better!! There's also some other hidden menus that control certain radio settings but I would suggest not to mess with them. I've listed below how to access and adjust the hidden equalizer only.

Before you adjust the front and rear speakers equalization or tone you should know, the front speakers have 4 frequencies (L1 Low bass, L2 Mid bass, Mid, & High) and the back speakers have just 3 frequencies (Bass, Mid & High) that can be adjusted.
This menu can be accessed on my 2003 XC70 by doing the following:

Make sure key is in and turned to accessory position so the radio wil have power available, then

With radio off, press and hold the source button.
Then, press and release the Volume/on/off button.
Continue holding the source button.
In a few seconds the Equalizer Menu will appear.

Press the source button to change which frequency you want to adjust and turn the source button the adjust how much you want to boost or cut a particular frequency.

To save your settings, simply turn off the radio.

Hint: Turn your fader control to full front while adjusting the front speakers and then to full back while adjusting the back speakers. Makes it easier the hear your EQ changes.

THIS MADE A HUGH DIFFERENCE IN THE SOUND OF MY STEREO!!

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